You may want to earn and save a Silla de montar sañosa on one of your alts before 6.0.2 is released so that you can purchase this mount as soon as it enters the game. When the patch is released you can purchase the mount on your alt and mail it to the character you wish to use the mount on.

If you don't have a saddle saved from the previous season you will need to wait until Warlords Season 1 starts in early December to get this mount.

After opening a ticket to ask whether my previously earned tokens could be redeemed to get this mount once released, i was told "it couldn't" and that the "tokens were to be replaced in Warlords of Draenor"

This was not the case and on the release of 6.0.2, I was able to purchase the mount with the previous seasons achievement token.